Once again thank you! I've pasted below the information pertaining to the Mail lock up
8/27/15 9:18:26.429 AM Mail: Using V2 Layout
8/27/15 9:18:28.738 AM Mail: [0x7fb2fc034180] |ISyncSession|Error| ISyncSession record validation failure: Value pushed for property portNumber on com.apple.mail.Account is not of expected class NSString (string), rather __NSCFNumber.
8/27/15 9:18:28.738 AM Mail: exception raised during syncing: ISyncSession record validation failure: Value pushed for property portNumber on com.apple.mail.Account is not of expected class NSString (string), rather __NSCFNumber.
8/27/15 9:19:05.560 AM Mail: [<_LibSasl2SASLClient: 0x7fb2fb0115c0> mechanism: PLAIN security layer: no] Failed to start the SASL connection
SASL(-1): generic failure:
8/27/15 9:20:05.415 AM Mail: [<_LibSasl2SASLClient: 0x7fb2fc404f40> mechanism: PLAIN security layer: no] Failed to start the SASL connection
SASL(-1): generic failure:
8/27/15 9:21:29.359 AM com.apple.launchd.peruser.501: ([0x0-0xfc0fc].com.apple.mail[3063]) Exited: Terminated: 15
8/27/15 9:21:41.427 AM spindump: Saved hang report for Mail version 5.3 (1283) to /Library/Logs/DiagnosticReports/Mail_2015-08-27-092141_*****-MacBook-Pro.hang